Study on Hiss Noise Reduction Method in Turbocharged Vehicles
2022-01-0352
03/29/2022
- Event
- Content
- The application of turbocharger in fuel vehicle brings high frequency noise, which seriously affects the ride comfort of vehicle. The problem of improving the hiss noise of a turbocharged vehicle in use was studied in this paper.Firstly，under different operating conditions and whether the air intake system is wrapped or not, the noise in the vehicle cabin and the driver's right ear are tested, and the noise sources and noise characteristics are identified. Then, the acoustic calculation model of the muffler is established, and the transmission loss of the original muffler behind the turbocharger is calculated. The transmission loss of the muffler is measured by the double-load impedance tube method.The finite element calculation model is verified by comparing the transmission loss of muffler calculated with tested. Thirdly, the rear muffler of turbocharger is redesigned. The improved muffler has a great improvement in the performance of eliminating high frequency noise, and its transmission loss beyond 20dB is expanded to 1600Hz~3500Hz range. The improved muffler is trial-manufactured and installed on the test vehicle, and the vehicle noise is tested again. The test results show that the noise in the frequency band of 1600~2400Hz is obviously reduced in the near field of the muffler behind the turbocharger, and the maximum reduction is 9dB. Subjective evaluation also show that the high frequency hiss noise also improved significantly in the car. The method to improve the Hiss noise in turbocharger is proposed in this paper, and the influence of air flow on engine performance is considered. It can provide reference for the application of engineering development of turbocharger.
- Citation
- Ou Yang, Y., "Study on Hiss Noise Reduction Method in Turbocharged Vehicles," SAE Technical Paper 2022-01-0352, 2022, .